Rollup merge of #152469 - mu001999-contrib:cleanup/unused-features, r=nadrieril,jdonszelmann

Remove unused features

Detected by https://github.com/rust-lang/rust/pull/152164.

~~Only allow `unused_features` if there are complex platform-specific features enabled.~~

compiler/rustc_abi/src/lib.rs

@@ -1,5 +1,5 @@
 // tidy-alphabetical-start
-#![cfg_attr(all(feature = "nightly", bootstrap), feature(assert_matches))]
+#![cfg_attr(all(feature = "nightly", bootstrap, test), feature(assert_matches))]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
 #![cfg_attr(feature = "nightly", feature(step_trait))]

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -2,8 +2,8 @@
 // Note: please avoid adding other feature gates where possible
 #![feature(rustc_private)]
 // Only used to define intrinsics in `compiler_builtins.rs`.
-#![feature(f16)]
-#![feature(f128)]
+#![cfg_attr(feature = "jit", feature(f16))]
+#![cfg_attr(feature = "jit", feature(f128))]
 // Note: please avoid adding other feature gates where possible
 #![warn(rust_2018_idioms)]
 #![warn(unreachable_pub)]

compiler/rustc_data_structures/src/lib.rs

@@ -12,6 +12,7 @@
 #![allow(rustc::potential_query_instability)]
 #![cfg_attr(bootstrap, feature(assert_matches))]
 #![cfg_attr(bootstrap, feature(cold_path))]
+#![cfg_attr(test, feature(test))]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![feature(allocator_api)]
 #![feature(ascii_char)]
@@ -30,7 +31,6 @@
 #![feature(ptr_alignment_type)]
 #![feature(rustc_attrs)]
 #![feature(sized_hierarchy)]
-#![feature(test)]
 #![feature(thread_id_value)]
 #![feature(trusted_len)]
 #![feature(type_alias_impl_trait)]

compiler/rustc_errors/src/lib.rs

@@ -14,8 +14,6 @@
 #![feature(negative_impls)]
 #![feature(never_type)]
 #![feature(rustc_attrs)]
-#![feature(try_blocks)]
-#![feature(yeet_expr)]
 // tidy-alphabetical-end
 
 extern crate self as rustc_errors;

compiler/rustc_index/src/lib.rs

@@ -1,6 +1,7 @@
 // tidy-alphabetical-start
 #![cfg_attr(all(feature = "nightly", test), feature(stmt_expr_attributes))]
-#![cfg_attr(feature = "nightly", feature(extend_one, step_trait, test))]
+#![cfg_attr(all(feature = "nightly", test), feature(test))]
+#![cfg_attr(feature = "nightly", feature(extend_one, step_trait))]
 #![cfg_attr(feature = "nightly", feature(new_range_api))]
 // tidy-alphabetical-end
 

compiler/rustc_macros/src/lib.rs

@@ -1,6 +1,5 @@
 // tidy-alphabetical-start
 #![allow(rustc::default_hash_types)]
-#![feature(if_let_guard)]
 #![feature(never_type)]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_tracked_env)]

compiler/rustc_metadata/src/lib.rs

@@ -1,6 +1,5 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
-#![feature(decl_macro)]
 #![feature(error_iter)]
 #![feature(file_buffered)]
 #![feature(gen_blocks)]

compiler/rustc_middle/src/lib.rs

@@ -28,6 +28,7 @@
 #![allow(internal_features)]
 #![allow(rustc::direct_use_of_rustc_type_ir)]
 #![cfg_attr(bootstrap, feature(assert_matches))]
+#![cfg_attr(doc, feature(intra_doc_pointers))]
 #![feature(allocator_api)]
 #![feature(associated_type_defaults)]
 #![feature(box_as_ptr)]
@@ -43,7 +44,6 @@
 #![feature(file_buffered)]
 #![feature(gen_blocks)]
 #![feature(if_let_guard)]
-#![feature(intra_doc_pointers)]
 #![feature(min_specialization)]
 #![feature(negative_impls)]
 #![feature(never_type)]
@@ -56,7 +56,6 @@
 #![feature(try_trait_v2_residual)]
 #![feature(try_trait_v2_yeet)]
 #![feature(type_alias_impl_trait)]
-#![feature(unwrap_infallible)]
 #![feature(yeet_expr)]
 #![recursion_limit = "256"]
 // tidy-alphabetical-end

compiler/rustc_parse/src/lib.rs

@@ -2,12 +2,12 @@
 
 // tidy-alphabetical-start
 #![cfg_attr(bootstrap, feature(assert_matches))]
+#![cfg_attr(test, feature(iter_order_by))]
 #![feature(box_patterns)]
 #![feature(debug_closure_helpers)]
 #![feature(default_field_values)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
-#![feature(iter_order_by)]
 #![recursion_limit = "256"]
 // tidy-alphabetical-end
 

compiler/rustc_passes/src/lib.rs

@@ -4,11 +4,6 @@
 //!
 //! This API is completely unstable and subject to change.
 
-// tidy-alphabetical-start
-#![feature(if_let_guard)]
-#![feature(map_try_insert)]
-// tidy-alphabetical-end
-
 use rustc_middle::query::Providers;
 
 pub mod abi_test;

compiler/rustc_pattern_analysis/src/lib.rs

@@ -4,7 +4,6 @@
 
 // tidy-alphabetical-start
 #![allow(unused_crate_dependencies)]
-#![cfg_attr(feature = "rustc", feature(if_let_guard))]
 // tidy-alphabetical-end
 
 pub(crate) mod checks;

compiler/rustc_public_bridge/src/lib.rs

@@ -14,7 +14,6 @@
 // tidy-alphabetical-start
 #![allow(rustc::usage_of_ty_tykind)]
 #![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
-#![feature(sized_hierarchy)]
 #![feature(trait_alias)]
 // tidy-alphabetical-end
 

compiler/rustc_resolve/src/lib.rs

@@ -15,7 +15,6 @@
 #![feature(const_default)]
 #![feature(const_trait_impl)]
 #![feature(control_flow_into_value)]
-#![feature(decl_macro)]
 #![feature(default_field_values)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]

compiler/rustc_serialize/src/lib.rs

@@ -3,7 +3,6 @@
 // tidy-alphabetical-start
 #![allow(internal_features)]
 #![allow(rustc::internal)]
-#![cfg_attr(test, feature(test))]
 #![doc(test(attr(allow(unused_variables), deny(warnings), allow(internal_features))))]
 #![feature(core_intrinsics)]
 #![feature(min_specialization)]

compiler/rustc_type_ir/src/lib.rs

@@ -5,10 +5,7 @@
 #![allow(rustc::usage_of_type_ir_inherent)]
 #![allow(rustc::usage_of_type_ir_traits)]
 #![cfg_attr(feature = "nightly", allow(internal_features))]
-#![cfg_attr(
-    feature = "nightly",
-    feature(associated_type_defaults, never_type, rustc_attrs, negative_impls)
-)]
+#![cfg_attr(feature = "nightly", feature(associated_type_defaults, rustc_attrs, negative_impls))]
 // tidy-alphabetical-end
 
 extern crate self as rustc_type_ir;

library/alloc/src/boxed.rs

@@ -1514,7 +1514,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     /// Recreate a `Box` which was previously converted to a `NonNull` pointer
     /// using [`Box::into_non_null_with_allocator`]:
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::System;
     ///
@@ -1524,7 +1524,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     /// ```
     /// Manually create a `Box` from scratch by using the system allocator:
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null, slice_ptr_get)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::{Allocator, Layout, System};
     ///
@@ -1629,7 +1629,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     /// Converting the `NonNull` pointer back into a `Box` with
     /// [`Box::from_non_null_in`] for automatic cleanup:
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::System;
     ///
@@ -1640,7 +1640,7 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
     /// Manual cleanup by explicitly running the destructor and deallocating
     /// the memory:
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::{Allocator, Layout, System};
     ///

library/alloc/src/lib.rs

@@ -56,6 +56,7 @@
 //! [`Rc`]: rc
 //! [`RefCell`]: core::cell
 
+#![allow(unused_features)]
 #![allow(incomplete_features)]
 #![allow(unused_attributes)]
 #![stable(feature = "alloc", since = "1.36.0")]
@@ -85,13 +86,11 @@
 //
 // Library features:
 // tidy-alphabetical-start
-#![cfg_attr(not(no_global_oom_handling), feature(string_replace_in_place))]
 #![feature(allocator_api)]
 #![feature(array_into_iter_constructors)]
 #![feature(ascii_char)]
 #![feature(async_fn_traits)]
 #![feature(async_iterator)]
-#![feature(box_vec_non_null)]
 #![feature(bstr)]
 #![feature(bstr_internals)]
 #![feature(cast_maybe_uninit)]
@@ -148,7 +147,6 @@
 #![feature(slice_ptr_get)]
 #![feature(slice_range)]
 #![feature(std_internals)]
-#![feature(str_internals)]
 #![feature(temporary_niche_types)]
 #![feature(transmutability)]
 #![feature(trivial_clone)]
@@ -158,7 +156,6 @@
 #![feature(try_blocks)]
 #![feature(try_trait_v2)]
 #![feature(try_trait_v2_residual)]
-#![feature(try_with_capacity)]
 #![feature(tuple_trait)]
 #![feature(ub_checks)]
 #![feature(unicode_internals)]
@@ -176,10 +173,8 @@
 #![feature(const_trait_impl)]
 #![feature(coroutine_trait)]
 #![feature(decl_macro)]
-#![feature(derive_const)]
 #![feature(dropck_eyepatch)]
 #![feature(fundamental)]
-#![feature(hashmap_internals)]
 #![feature(intrinsics)]
 #![feature(lang_items)]
 #![feature(min_specialization)]

library/alloc/src/vec/mod.rs

@@ -1238,7 +1238,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::System;
     ///
@@ -1265,7 +1265,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// Using memory that was allocated elsewhere:
     ///
     /// ```rust
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::{AllocError, Allocator, Global, Layout};
     ///
@@ -1365,7 +1365,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(allocator_api, box_vec_non_null)]
+    /// #![feature(allocator_api)]
     ///
     /// use std::alloc::System;
     ///

library/alloctests/lib.rs

@@ -16,7 +16,6 @@
 // tidy-alphabetical-start
 #![feature(allocator_api)]
 #![feature(array_into_iter_constructors)]
-#![feature(box_vec_non_null)]
 #![feature(char_internals)]
 #![feature(const_alloc_error)]
 #![feature(const_cmp)]
@@ -55,16 +54,12 @@
 //
 // Language features:
 // tidy-alphabetical-start
-#![feature(cfg_sanitize)]
 #![feature(const_trait_impl)]
 #![feature(dropck_eyepatch)]
-#![feature(lang_items)]
 #![feature(min_specialization)]
-#![feature(negative_impls)]
 #![feature(never_type)]
 #![feature(optimize_attribute)]
 #![feature(prelude_import)]
-#![feature(rustc_allow_const_fn_unstable)]
 #![feature(rustc_attrs)]
 #![feature(staged_api)]
 #![feature(test)]

library/alloctests/tests/lib.rs

@@ -3,7 +3,6 @@
 #![feature(const_heap)]
 #![feature(deque_extend_front)]
 #![feature(iter_array_chunks)]
-#![feature(wtf8_internals)]
 #![feature(cow_is_borrowed)]
 #![feature(core_intrinsics)]
 #![feature(downcast_unchecked)]
@@ -30,8 +29,6 @@
 #![feature(string_remove_matches)]
 #![feature(const_btree_len)]
 #![feature(const_trait_impl)]
-#![feature(panic_update_hook)]
-#![feature(pointer_is_aligned_to)]
 #![feature(test)]
 #![feature(thin_box)]
 #![feature(drain_keep_rest)]

library/core/src/ascii/ascii_char.rs

@@ -878,7 +878,7 @@ impl AsciiChar {
     /// # Examples
     ///
     /// ```
-    /// #![feature(ascii_char, ascii_char_variants, is_ascii_octdigit)]
+    /// #![feature(ascii_char, ascii_char_variants)]
     ///
     /// use std::ascii;
     ///

library/core/src/cell.rs

@@ -774,7 +774,6 @@ impl<T, const N: usize> Cell<[T; N]> {
 /// following is unsound:
 ///
 /// ```rust
-/// #![feature(cell_get_cloned)]
 /// # use std::cell::Cell;
 ///
 /// #[derive(Copy, Debug)]

library/core/src/convert/num.rs

@@ -219,6 +219,7 @@ impl_float_from_bool!(
     f16;
     doctest_prefix:
     // rustdoc doesn't remove the conventional space after the `///`
+    ///# #![allow(unused_features)]
     ///#![feature(f16)]
     ///# #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///
@@ -230,6 +231,7 @@ impl_float_from_bool!(f64);
 impl_float_from_bool!(
     f128;
     doctest_prefix:
+    ///# #![allow(unused_features)]
     ///#![feature(f128)]
     ///# #[cfg(all(target_arch = "x86_64", target_os = "linux"))] {
     ///

library/core/src/lib.rs

@@ -87,6 +87,7 @@
 #![allow(incomplete_features)]
 #![warn(multiple_supertrait_upcastable)]
 #![allow(internal_features)]
+#![allow(unused_features)]
 #![deny(ffi_unwind_calls)]
 #![warn(unreachable_pub)]
 // Do not check link redundancy on bootstrapping phase
@@ -95,9 +96,7 @@
 //
 // Library features:
 // tidy-alphabetical-start
-#![feature(array_ptr_get)]
 #![feature(asm_experimental_arch)]
-#![feature(bstr)]
 #![feature(bstr_internals)]
 #![feature(cfg_select)]
 #![feature(cfg_target_has_reliable_f16_f128)]
@@ -106,31 +105,15 @@
 #![feature(const_destruct)]
 #![feature(const_eval_select)]
 #![feature(const_select_unpredictable)]
-#![feature(const_unsigned_bigint_helpers)]
 #![feature(core_intrinsics)]
 #![feature(coverage_attribute)]
 #![feature(disjoint_bitor)]
 #![feature(internal_impls_macro)]
-#![feature(ip)]
-#![feature(is_ascii_octdigit)]
 #![feature(link_cfg)]
 #![feature(offset_of_enum)]
 #![feature(panic_internals)]
 #![feature(pattern_type_macro)]
-#![feature(ptr_alignment_type)]
-#![feature(ptr_metadata)]
-#![feature(set_ptr_value)]
-#![feature(signed_bigint_helpers)]
-#![feature(slice_ptr_get)]
-#![feature(str_internals)]
-#![feature(str_split_inclusive_remainder)]
-#![feature(str_split_remainder)]
-#![feature(type_info)]
 #![feature(ub_checks)]
-#![feature(unsafe_pinned)]
-#![feature(utf16_extra)]
-#![feature(variant_count)]
-#![feature(widening_mul)]
 // tidy-alphabetical-end
 //
 // Language features:
@@ -175,7 +158,6 @@
 #![feature(optimize_attribute)]
 #![feature(pattern_types)]
 #![feature(prelude_import)]
-#![feature(reborrow)]
 #![feature(repr_simd)]
 #![feature(rustc_allow_const_fn_unstable)]
 #![feature(rustc_attrs)]

library/core/src/num/f128.rs

@@ -148,7 +148,10 @@ pub mod consts {
     pub const LN_10: f128 = 2.30258509299404568401799145468436420760110148862877297603333_f128;
 }
 
-#[doc(test(attr(feature(cfg_target_has_reliable_f16_f128), allow(internal_features))))]
+#[doc(test(attr(
+    feature(cfg_target_has_reliable_f16_f128),
+    allow(internal_features, unused_features)
+)))]
 impl f128 {
     /// The radix or base of the internal representation of `f128`.
     #[unstable(feature = "f128", issue = "116909")]
@@ -1470,7 +1473,11 @@ impl f128 {
 // Functions in this module fall into `core_float_math`
 // #[unstable(feature = "core_float_math", issue = "137578")]
 #[cfg(not(test))]
-#[doc(test(attr(feature(cfg_target_has_reliable_f16_f128), expect(internal_features))))]
+#[doc(test(attr(
+    feature(cfg_target_has_reliable_f16_f128),
+    expect(internal_features),
+    allow(unused_features)
+)))]
 impl f128 {
     /// Returns the largest integer less than or equal to `self`.
     ///

library/core/src/num/f16.rs

@@ -142,7 +142,10 @@ pub mod consts {
     pub const LN_10: f16 = 2.30258509299404568401799145468436421_f16;
 }
 
-#[doc(test(attr(feature(cfg_target_has_reliable_f16_f128), allow(internal_features))))]
+#[doc(test(attr(
+    feature(cfg_target_has_reliable_f16_f128),
+    allow(internal_features, unused_features)
+)))]
 impl f16 {
     /// The radix or base of the internal representation of `f16`.
     #[unstable(feature = "f16", issue = "116909")]

library/core/src/num/f32.rs

@@ -1821,6 +1821,7 @@ pub mod math {
     /// # Examples
     ///
     /// ```
+    /// # #![allow(unused_features)]
     /// #![feature(core_float_math)]
     ///
     /// # // FIXME(#140515): mingw has an incorrect fma

library/core/src/num/f64.rs

@@ -1819,6 +1819,7 @@ pub mod math {
     /// # Examples
     ///
     /// ```
+    /// # #![allow(unused_features)]
     /// #![feature(core_float_math)]
     ///
     /// # // FIXME(#140515): mingw has an incorrect fma

library/core/src/num/uint_macros.rs

@@ -3072,7 +3072,6 @@ macro_rules! uint_impl {
         /// implementing it for wider-than-native types.
         ///
         /// ```
-        /// #![feature(const_unsigned_bigint_helpers)]
         /// fn scalar_mul_eq(little_endian_digits: &mut Vec<u16>, multiplicand: u16) {
         ///     let mut carry = 0;
         ///     for d in little_endian_digits.iter_mut() {
@@ -3097,6 +3096,7 @@ macro_rules! uint_impl {
         /// except that it gives the value of the overflow instead of just whether one happened:
         ///
         /// ```
+        /// # #![allow(unused_features)]
         /// #![feature(const_unsigned_bigint_helpers)]
         /// let r = u8::carrying_mul(7, 13, 0);
         /// assert_eq!((r.0, r.1 != 0), u8::overflowing_mul(7, 13));
@@ -3109,6 +3109,7 @@ macro_rules! uint_impl {
         /// [`wrapping_add`](Self::wrapping_add) methods:
         ///
         /// ```
+        /// # #![allow(unused_features)]
         /// #![feature(const_unsigned_bigint_helpers)]
         /// assert_eq!(
         ///     789_u16.carrying_mul(456, 123).0,

library/core/src/ptr/alignment.rs

@@ -112,7 +112,6 @@ impl Alignment {
     ///
     /// ```
     /// #![feature(ptr_alignment_type)]
-    /// #![feature(layout_for_ptr)]
     /// use std::ptr::Alignment;
     ///
     /// assert_eq!(unsafe { Alignment::of_val_raw(&5i32) }.as_usize(), 4);

library/core/src/ptr/mut_ptr.rs

@@ -1800,7 +1800,6 @@ impl<T> *mut [T] {
     ///
     /// ```
     /// #![feature(raw_slice_split)]
-    /// #![feature(slice_ptr_get)]
     ///
     /// let mut v = [1, 0, 3, 0, 5, 6];
     /// let ptr = &mut v as *mut [_];

library/core/src/time.rs

@@ -690,7 +690,6 @@ impl Duration {
     /// # Examples
     ///
     /// ```
-    /// #![feature(duration_constants)]
     /// use std::time::Duration;
     ///
     /// assert_eq!(Duration::new(0, 0).saturating_add(Duration::new(0, 1)), Duration::new(0, 1));
@@ -801,7 +800,6 @@ impl Duration {
     /// # Examples
     ///
     /// ```
-    /// #![feature(duration_constants)]
     /// use std::time::Duration;
     ///
     /// assert_eq!(Duration::new(0, 500_000_001).saturating_mul(2), Duration::new(1, 2));

library/coretests/tests/lib.rs

@@ -13,7 +13,6 @@
 #![feature(cfg_target_has_reliable_f16_f128)]
 #![feature(char_internals)]
 #![feature(char_max_len)]
-#![feature(clamp_magnitude)]
 #![feature(clone_to_uninit)]
 #![feature(const_array)]
 #![feature(const_bool)]
@@ -35,7 +34,6 @@
 #![feature(const_trait_impl)]
 #![feature(const_unsigned_bigint_helpers)]
 #![feature(control_flow_ok)]
-#![feature(core_float_math)]
 #![feature(core_intrinsics)]
 #![feature(core_intrinsics_fallbacks)]
 #![feature(core_io_borrowed_buf)]
@@ -47,7 +45,6 @@
 #![feature(drop_guard)]
 #![feature(duration_constants)]
 #![feature(duration_constructors)]
-#![feature(error_generic_member_access)]
 #![feature(exact_div)]
 #![feature(exact_size_is_empty)]
 #![feature(extend_one)]
@@ -55,7 +52,6 @@
 #![feature(f16)]
 #![feature(f128)]
 #![feature(float_algebraic)]
-#![feature(float_gamma)]
 #![feature(float_minimum_maximum)]
 #![feature(flt2dec)]
 #![feature(fmt_internals)]
@@ -94,7 +90,6 @@
 #![feature(nonzero_from_str_radix)]
 #![feature(numfmt)]
 #![feature(one_sided_range)]
-#![feature(option_reduce)]
 #![feature(pattern)]
 #![feature(pointer_is_aligned_to)]
 #![feature(portable_simd)]
@@ -114,7 +109,6 @@
 #![feature(step_trait)]
 #![feature(str_internals)]
 #![feature(strict_provenance_lints)]
-#![feature(test)]
 #![feature(trusted_len)]
 #![feature(trusted_random_access)]
 #![feature(try_blocks)]

library/panic_unwind/src/lib.rs

@@ -17,7 +17,6 @@
 #![feature(cfg_emscripten_wasm_eh)]
 #![feature(cfg_select)]
 #![feature(core_intrinsics)]
-#![feature(lang_items)]
 #![feature(panic_unwind)]
 #![feature(staged_api)]
 #![feature(std_internals)]
@@ -25,6 +24,7 @@
 #![panic_runtime]
 #![feature(panic_runtime)]
 #![allow(internal_features)]
+#![allow(unused_features)]
 #![warn(unreachable_pub)]
 #![deny(unsafe_op_in_unsafe_fn)]
 

library/std/src/num/f128.rs

@@ -16,6 +16,7 @@ use crate::intrinsics;
 use crate::sys::cmath;
 
 #[cfg(not(test))]
+#[doc(test(attr(allow(unused_features))))]
 impl f128 {
     /// Raises a number to a floating point power.
     ///

library/std/src/num/f16.rs

@@ -916,7 +916,6 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// #![feature(float_gamma)]
     /// # #[cfg(not(miri))]
     /// # #[cfg(target_has_reliable_f16_math)] {
     ///
@@ -952,7 +951,6 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// #![feature(float_gamma)]
     /// # #[cfg(not(miri))]
     /// # #[cfg(target_has_reliable_f16_math)] {
     ///
@@ -988,7 +986,6 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// #![feature(float_erf)]
     /// # #[cfg(not(miri))]
     /// # #[cfg(target_has_reliable_f16_math)] {
     /// /// The error function relates what percent of a normal distribution lies
@@ -1028,7 +1025,6 @@ impl f16 {
     ///
     /// ```
     /// #![feature(f16)]
-    /// #![feature(float_erf)]
     /// # #[cfg(not(miri))]
     /// # #[cfg(target_has_reliable_f16_math)] {
     /// let x: f16 = 0.123;

library/std/tests/floats/lib.rs

@@ -1,4 +1,4 @@
-#![feature(f16, f128, float_gamma, float_minimum_maximum, cfg_target_has_reliable_f16_f128)]
+#![feature(f16, f128, float_gamma, cfg_target_has_reliable_f16_f128)]
 #![expect(internal_features)] // for reliable_f16_f128
 
 use std::fmt;

library/std/tests/volatile-fat-ptr.rs

@@ -1,5 +1,4 @@
 #![allow(stable_features)]
-#![feature(volatile)]
 
 use std::ptr::{read_volatile, write_volatile};
 

library/std_detect/tests/cpu-detection.rs

@@ -1,4 +1,4 @@
-#![allow(internal_features)]
+#![allow(internal_features, unused_features)]
 #![feature(stdarch_internal)]
 #![cfg_attr(target_arch = "arm", feature(stdarch_arm_feature_detection))]
 #![cfg_attr(

library/std_detect/tests/macro_trailing_commas.rs

@@ -1,4 +1,4 @@
-#![allow(internal_features)]
+#![allow(internal_features, unused_features)]
 #![cfg_attr(
     any(
         target_arch = "arm",

library/test/src/lib.rs

@@ -24,7 +24,7 @@
 #![feature(staged_api)]
 #![feature(process_exitcode_internals)]
 #![feature(panic_can_unwind)]
-#![feature(test)]
+#![cfg_attr(test, feature(test))]
 #![feature(thread_spawn_hook)]
 #![allow(internal_features)]
 #![warn(rustdoc::unescaped_backticks)]

library/unwind/src/lib.rs

@@ -4,12 +4,12 @@
 #![feature(cfg_select)]
 #![feature(link_cfg)]
 #![feature(staged_api)]
-#![cfg_attr(not(target_env = "msvc"), feature(libc))]
 #![cfg_attr(
     all(target_family = "wasm", any(not(target_os = "emscripten"), emscripten_wasm_eh)),
     feature(link_llvm_intrinsics, simd_wasm64)
 )]
 #![allow(internal_features)]
+#![allow(unused_features)]
 #![deny(unsafe_op_in_unsafe_fn)]
 
 // Force libc to be included even if unused. This is required by many platforms.

src/librustdoc/lib.rs

@@ -6,12 +6,10 @@
 )]
 #![feature(ascii_char)]
 #![feature(ascii_char_variants)]
-#![feature(box_into_inner)]
 #![feature(box_patterns)]
 #![feature(file_buffered)]
 #![feature(formatting_options)]
 #![feature(if_let_guard)]
-#![feature(iter_advance_by)]
 #![feature(iter_intersperse)]
 #![feature(iter_order_by)]
 #![feature(rustc_private)]